um yes, beefcake friends who do crimes and have also hooked up? that's everything to me. MAYBE, since apollo tends to go more high end and vash is good at getting down and dirty, they can kind of have a mutually-beneficial friendship where they help one another out when they need it? i.e. if apollo needs to do something seedy he knows he can contact vash to give him a hand, and if vash finds himself needing access to something that seems a little out of reach apollo can swing by and boost him up? all while flirting always, obviously.